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Goodwill - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |
Beginning balance | $ 6,633,000 |
Goodwill | 13,595,000 | $ 13,595,000
Accumulated impairment losses | (6,962,000) | (6,962,000)
Ending Balance | 6,633,000 | 6,633,000
Impairment of goodwill | 0 |
Net exchange differences | 0 |
Semiconductor |  |
Goodwill [Line Items] |  |
Impairment of goodwill | 0 |
SiC/LED |  |
Goodwill [Line Items] |  |
Impairment of goodwill | 0 |
Net Goodwill-Continuing Operations |  |
Goodwill [Line Items] |  |
Beginning balance | 6,633,000 |
Goodwill | 10,228,000 | 10,228,000
Accumulated impairment losses | (3,595,000) | (3,595,000)
Ending Balance | 6,633,000 | 6,633,000
Impairment of goodwill | 0 |
Net exchange differences | 0 |
Net Goodwill-Continuing Operations | Semiconductor |  |
Goodwill [Line Items] |  |
Beginning balance | 5,905,000 |
Goodwill | 5,905,000 | 5,905,000
Accumulated impairment losses | 0 | 0
Ending Balance | 5,905,000 | 5,905,000
Impairment of goodwill | 0 |
Net exchange differences | 0 |
Net Goodwill-Continuing Operations | SiC/LED |  |
Goodwill [Line Items] |  |
Beginning balance | 728,000 |
Goodwill | 728,000 | 728,000
Accumulated impairment losses | 0 | 0
Ending Balance | 728,000 | 728,000
Impairment of goodwill | 0 |
Net exchange differences | 0 |
Net Goodwill-Continuing Operations | Automation |  |
Goodwill [Line Items] |  |
Beginning balance | 0 |
Goodwill | 3,595,000 | 3,595,000
Accumulated impairment losses | (3,595,000) | (3,595,000)
Ending Balance | 0 | 0
Impairment of goodwill | 0 |
Net exchange differences | 0 |
Discontinued Operations |  |
Goodwill [Line Items] |  |
Beginning balance | 0 |
Goodwill | 3,367,000 | 3,367,000
Accumulated impairment losses | (3,367,000) | (3,367,000)
Ending Balance | 0 | $ 0
Impairment of goodwill | 0 |
Net exchange differences | $ 0 |

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